https://forge.codesys.com/forge/talk/Engineering/thread/59f373c00d/2021-09-22T06:14:21.613000ZRecent posts to Structure Bug2021-09-22T06:14:21.613000Z2021-09-22T06:14:21.613000ZQuirzohttps://forge.codesys.com/u/quirzo/https://forge.codesys.com95eba82f8c194a486579849ac26bc44044620e54

<div class="markdown_content"><p>It's how C-style strings work. The system needs to know somehow when it ends and that is done by adding a 0 byte to the end of the text.</p> <p><a href="https://en.wikipedia.org/wiki/Null-terminated_string" rel="nofollow">https://en.wikipedia.org/wiki/Null-terminated_string</a></p></div>

2021-09-21T11:30:18.153000Z2021-09-21T11:30:18.153000ZReinier Geershttps://forge.codesys.com/u/reinier-geers/https://forge.codesys.com7f048da78b38f3a916897804c0897159dbd5a19e

<div class="markdown_content"><p>Why is there a string end ? I try now with AT %MD Hopefully it will solve my problem. </p></div>

2021-09-21T09:31:12.291000Z2021-09-21T09:31:12.291000Zquirzohttps://forge.codesys.com/u/quirzo/https://forge.codesys.comb571442be79c5b7b4ce807ffcc0e3ae784de8743

<div class="markdown_content"><p>Remember that STRING takes always one extra byte, as there is always a string end byte. So STRING(16) takes 17 bytes.</p></div>

2021-09-21T08:48:19.108000Z2021-09-21T08:48:19.108000ZReinier Geershttps://forge.codesys.com/u/reinier-geers/https://forge.codesys.com2eb2b34496931ac64c6218027990f35d4ab84787

<div class="markdown_content"><p>Thanks ! But same problem. if there is a real or string its a problem.</p> <p>{attribute 'pack_mode' := '1'} <br/> TYPE stNIR_400_Ethernet :<br/> STRUCT<br/> usiDHCP :USINT;<br/> sIP_Adres :STRING(16);<br/> sIP_Sub :STRING(16);<br/> sIP_Gate :STRING(16);<br/> sIP_Server :STRING(16);<br/> sGauge_ID :STRING(65);<br/> usiDiag_Dump :USINT;<br/> sDiag_UDP_Adr :STRING(16);<br/> sProfinet :STRING(65);<br/> arrDummy :ARRAY<span>[1..37]</span> OF USINT;<br/> uiCRC :UINT ;</p> <p>END_STRUCT<br/> END_TYPE</p> <p><img src="./attachment/attachment.png" width="50%"/></p></div>

2021-09-21T07:59:44.902000Z2021-09-21T07:59:44.902000Zquirzohttps://forge.codesys.com/u/quirzo/https://forge.codesys.comdae484f6c151175cb123759186cbd3889a45a911

<div class="markdown_content"><p>It might be because of pack mode, which causes padding bytes between structure variables.</p> <p>Try to add </p> <div class="codehilite"><pre><span></span><span class="err">{attribute 'pack_mode' := '1'} </span> </pre></div> <p>above the struct definition. In pack mode 1, there are no padding bytes and the copy should work.</p> <p>Example (from Beckhoff site, <a href="https://infosys.beckhoff.com/english.php?content=../content/1033/tc3_plc_intro/2529746059.html&amp;id=3686945105176987925" rel="nofollow">https://infosys.beckhoff.com/english.php?content=../content/1033/tc3_plc_intro/2529746059.html&amp;id=3686945105176987925</a>):</p> <div class="codehilite"><pre><span></span><span class="err">{attribute 'pack_mode' := '1'} </span> <span class="err">TYPE ST_MyStruct: </span> <span class="err">STRUCT </span> <span class="err"> bEnable : BOOL;</span> <span class="err"> nCounter : INT; </span> <span class="err"> nMaxSize : INT;</span> <span class="err"> bMaxSizeReached : BOOL;</span> <span class="err"> bReset : BOOL;</span> <span class="err">END_STRUCT</span> <span class="err">END_TYPE </span> </pre></div> </div>

2021-09-20T12:04:04.192000Z2021-09-20T12:04:04.192000ZReinier Geershttps://forge.codesys.com/u/reinier-geers/https://forge.codesys.comd245634b4fb71cf061ace888834bf5136d95702f

<div class="markdown_content"><p>Codesys 3.5.9.2. I recieve data to an Array. Then i use Sysmemcpy to copy it to a structure .But with real and string it misses a byte. So 16 bytes i have to copy to a string(15). WHY ?? For real i have to copy byte 4-7 to get the right value. </p></div>